Comparison

DONIA vs Ocean Signal

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

DONIA

This app provides detailed seabed visualization and marine information for safe and respectful sea navigation. It allows users to book mooring buoys, share observations, and monitor their vessels. Access premium features like high-definition charts for enhanced planning and exploration.

Highlights
  • Seabed visualization
  • Marine information access
  • Mooring buoy booking
  • User observation sharing
  • Navigation preparation and monitoring
  • Mooring monitoring with alarms
  • Offline mapping
Features
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DONIA – Enjoy & protect the sea, together Donia is the reference app to choose your anchorages and navigate safely while minimizing your impact on the seabed. Join a community of over 100,000 sea enthusiasts who use DONIA to plan and experience their journeys across the Mediterranean and beyond. *** Visualize the seabed and anchor in the right place *** • High-precision mapping of marine habitats (Posidonia, coralligenous reefs, Cymodocea, sand and rock)
• Enhanced anchoring assistance with weather conditions
• Improved anchor alarm system
• Smart selection of anchoring zones adapted to your vessel *** Complete nautical charts *** • Detailed mapping of navigation areas (French Mediterranean, Atlantic, Greece, Andalusia, Liguria, Croatia, Balearics)
• Advanced integration of SHOM charts and HD bathymetric layers (Premium)
• Optimized map display for real-time navigation *** A community of sailors *** • View and share sea observations
• Rating system and favorites
• Easy sharing inside and outside the app *** Donia Mooring – connected buoys *** • Connected mooring buoys for vessels over 24m
• Dedicated anchoring zones
• In-app booking, payment and management *** DONIA Premium *** • Advanced SHOM chart integration
• Access to HD bathymetric layers A mission: protecting the sea Created by marine biologists and divers from Andromède Océanologie, DONIA aims to make seabed maps visible and accessible so everyone can contribute to their protection. Inspired by maritime solidarity, the app continuously evolves based on user feedback to become a more innovative, useful and effective anchoring tool. Information Using GPS in the background may significantly reduce battery life.
 Your subscription renews automatically unless you cancel it at least 24 hours before the end of the current billing period. Payment will be charged to your iTunes account upon confirmation of purchase. You can manage your subscriptions and turn off automatic renewal in your account settings after purchase. Privacy Policy: https://mooring.donia.fr/cgv/donia/cgv-donia-fr.pdf Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

Ocean Signal

Access critical information for emergency beacons and live data from Class B AIS devices. Utilize NFC for PLB, EPIRB, and MOB details, including battery status and test results. Configure settings and view live AIS targets via WiFi connection.

Highlights
  • Emergency beacon information access
  • Live Class B AIS data
  • NFC for PLB/EPIRB/MOB details
  • Battery condition and test results
  • Change MOB settings
  • WiFi connection for ATB1 AIS
  • Vessel detail configuration
Features
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The Ocean Signal App allows easy access to Emergency PLB/EPIRB/MOB information as well as live information from your Class B AIS. NFC (Near Field Communication) allows access to PLB, EPIRB and MOB details where operation time, Battery condition and test results can be easily checked and displayed on a mobile device. You can even change settings for your MOB's like adding a MMSI without turning the product on! The use of NFC ensures that maximum battery capacity can be ensured giving you confidence that a Beacon will give maximum performance when required in an emergency situation. WiFi connection to the Ocean Signal ATB1 gives access to live AIS target data along with status and performance details, as well as test and Ownership details for Distress Beacons. Initial configuration with vessel details for the ATB1 Class B AIS is also carried out via the WiFi connection.

Screenshots

DONIA4 screens
Ocean Signal4 screens

Verdict

The call

The clearest difference is rating: Ocean Signal at 5.0 against DONIA's 4.5. Ocean Signal also leads on in-app purchases (none vs 2). DONIA's advantage is update cadence (fortnightly vs every 2 months) and review sentiment (59% vs 40%). On price, ads and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. DONIA sells 2 in-app purchases, starting at $2.49 per month. Ocean Signal asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Ocean Signal holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: DONIA has 31 ratings behind it against 1, so its average is the more settled of the two. Written reviews complicate that: 59% of DONIA's written reviews are positive against 40% of Ocean Signal's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

DONIA ships an update fortnightly, Ocean Signal every 2 months. The most recent releases landed on September 22, 2026 and September 10, 2026 respectively.

Scorecard7 real differences · 3 level
DONIA versus Ocean Signal: the parameters behind the verdict, then further details
ParameterDONIAOcean Signal
PriceFreeFree
Rating4.5 (31 ratings)5.0 (1 ratings) — better
Positive reviews59.3% of reviews — better40.0% of reviews
Number of ratings31 — better1
Update frequencyFortnightly — betterEvery 2 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFreemiumFree — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS11.0 — better15.0
Further details — not scored
Size61 MB116 MB
Age rating4+4+
DeveloperAndromede OceanologieOcean Signal Limited

Customer experience

DONIA

All ratings31 ratings
Positive87.1%
Neutral0.0%
Negative12.9%
Written reviews27 reviews
Positive59.3%
Neutral22.2%
Negative18.5%

Ocean Signal

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews10 reviews
Positive40.0%
Neutral0.0%
Negative60.0%

In-app purchases

2 purchases

DONIA

Subscriptions2
  • DONIA® Premium Monthly7 Days trial$2.491 Month
  • DONIA® Premium Version7 Days trial$22.991 Year
None

Ocean Signal

No in-app purchases

Questions

Is DONIA free?
DONIA is free to download, with in-app purchases available.
Is Ocean Signal free?
Ocean Signal is free to download, with no in-app purchases.
Which has better reviews, DONIA or Ocean Signal?
Ocean Signal is rated higher. DONIA averages 4.5 out of 5 from 31 ratings, while Ocean Signal averages 5.0 from 1 ratings.
Do DONIA or Ocean Signal have ads?
Neither DONIA nor Ocean Signal shows ads.
Which is updated more often, DONIA or Ocean Signal?
DONIA ships an update fortnightly, and Ocean Signal every 2 months. Most recently, DONIA was updated on September 22, 2026 and Ocean Signal on September 10, 2026.

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